Rotary woodworking cutter



rasees nee.' is, iena.

iii/"imitan aucuns, or Woncns'rnn, Massacnnsn'r'.rs.`

normar woonwonninccommun; i l

Application led November 24, 1920. Serial No. 426,266.

To aZ-Z whom t 'may concert/1,:

Be it known that T, lNiLLiAM H. JoNns, a

citizen of the United States, residing at lVorcester, in the county ofl Worcester and State of Massachusetts, have invented a. new

, and useful Rotary Vlloodworking Cutter, of

which the following is a specication.

yThis invention relates to an improvement on the usual proiilingcutter employed with wood working machinery for the purpose of forming the vedges of sashes, blinds, doors,

niouldings, and the like. i i i The principal objects of this invention are to provide an improved cutter. in which .each

separa-te part of the moulding will becut by a separate double ended bladeyindependent of theothers and adjustable along the sha-ft or spindle on which they are mounted, so as to vary the shape of the moulding merely by this adjustment and in which each blade and the whole seriesof blades will be perfectly balanced, thus` eliminating a large part of the vibration and noise; and also admitting of a very high rate of speed; and

especially to provideva` construction in which the sharpening of the blades can he per-` formed on an ordinary stone by unskilled workmen without affecting the shape of the cut to be made and without removing kor changing the position of the cutters.

Further objects and advantages of thev invention will appearhereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 is a side elevation of a set of cutters constructed in accordance with this invention, and

Fig. 2 is an end elevation of the same showing the work in cross section.

I have shown the invention as applied to the manufacture of a moulding l() having a curved surface 11, a hat surface 12, and a depressed flat surface 13 connected with the surface 12 along a vertical plane 14. This form of moulding therefore really involves three edge surfaces 1l, 12 and 13. Therefore l use three cutters A, B, and C. Each of these cutters has substantially the same characteristics, and I will describe in detail the cutter C. This has a hub l5 provided with a perforation for the reception of the shaft or spindle 16 on which itis mounted and to which it is keyed or otherwise fixed.

Extending fromy this hub in opposite directions parallel with each other and spaced enternalsurface for a distance.

apart are two integral arms 17. In the-form as concave. At the end of each armthere is an arcuate portion 19 which constitutes an` integral forwardly extending cutting jaw.

@n its outeri surface it is substantially concentric. with the shaft 16, but lrelieved vslightly, its highest point being at the forward end. This outer surface is either straight across as in the case of the two blades B `and C, or curved'as in the case of the blade A. This is arranged in accordance with the work to be performed,

The concave side of in a surface 20 `which is concentric with the surfaces are connected by a fiat surface 21. This is on the `inner side of the arm, and on its forward edge. lt isv inclined,"a`nd therefore produces `a sharp angle at itsouter end. Thisconstitutes the cutting edge, which vis sharpened by placing this surface 21 against a` flat sharpening-.surface or a. large cylinl d'rical one.

lt is to be observed that the external surface ot the blade is of the same shape throughout all its length and that that is the shape which is desired to have it forni on the work. Tt follows from this that when worn away byl sharpening, its cutting shape will continucthe same always. By sharpening it on a transverse dat surface 2l it will be clear that any ordinary workman can perform this operation, and the cutter will cut accurately thereafter, thus doing away with the necessity for having an eX- pert to sharpen the blade. The blades, all being of symmetrical shape with respect to a central point, are perfectly balanced, thus doing away with the vibration which would the arm '117 terminates These two.

so less power is required and less noise made. n The blades are also located angularly on the shaft with respect to each other, so that there is practically always .a blade in cutting position,y which also helps to eliminate the vibration. vThis permits of very high speed with perfect safety, By spacing the blades in this way and shaping them as shown and described, each'blade has, opposite the surface that has to be ground. a space vinto which a sharpening stone can be inserted for sharpening it with- ,out removing or adjusting` any of the six blades.k n

One of the blades, as for example C, Which euts'deeper into the Work than the nent one B, overlapsy its path. These two blades areset at an angle as stated;-

B. Therefore thewidthfof the surface l2 on `the Worktcanfbe varied materially by.

spacingthesetwo blades vl and@ apartthe desireddistancebyineans et a Washer D. Two 0r vthree. Washersmuay be provided of. dilerentwidths. Each of lthem controls` the Width of the surface 12. The. Width vof the,y surface y 13 is g'controlled by. the relative -location of theentire cut'teiijto the Work il).

Very often 4itprojects beyond `the edge `oit' the Work as indicated. By the simple means of.' providing this overlap and the adjustment by `means. of the Washers," importantvariation can be vmade in the moulding produced Without interehangingtheaoutters or l It Will beunderstoodjthat isiadapted forfmaking an yindefinite nunkl even dismounting` the-inl from the shaft on which they are located.

ber of `shapeaand that `I have illustrated only oney ofy them. cipallyy for door-iframes,` blinds, interior finish,

and znouldingsy of various-character.'

s ilthough I have illustrated and described only -a single formv of the invention I v`am The cutting surface of the blade @can overlapHl the path of the cutting surtaceof the blade this ir'ivention` lt isintended prinev cutting yor profiling sashes, j

aware of the factI thatmany `inodiiications can be made therein byfany person skilled in the artl Without'departing from the scope of the invention as expressed in the claim.

rlherefore I donot Wishto be limited to all the detalls of constructionand relative arrangements or parts kherein shownfand described,y butWhat l do claim `is:-

ternal surfaces being'eoncentric but slightly relieved and shaped to produce the desired out, and an inner surface concentricwith the shaft, and fa .projecting inclined tor- Ward endsurface substantially tangent to said hub and'adapted to be ground otialong a plane on theinnersideofsaidjaiv to producek a cuttingfedgef of constant shape,` said blades .being that theistiaight b'aclr'ofl eachv arm is spaced from and substantially parallel to-said'end.

. so spaced circumferentially surface of thenext one to permit 'they insertion of asharpeningstone between them;

' In testimony whereof IV havehereuntol athxed my signature. vv WILLIAM riff-Jonits..y I 

